The SWG Commercial Series power venters fromField Controls(Kinston, NC) are available in 10-, 12-, and 14-in. sizes and comes with standard, single- phase 115/230 vac TEFC motors and are designed to vent oil and gas systems up to 3 MBtu with proper control kit. The SWG can be used with virtually any oil or gas appliance and can vent several appliances at once.